New fabrication techniques have been developed to produce a homogeneous array of very long - very thin filaments of Nb3Sn in a Cu matrix. With the use of chill casting and drawing techniques one can produce a superconducting composite wire 0.025 cm in diameter which has approximately 500,000 Nb3Sn filaments uniformly distributed across the cross section. Typically the filaments have a ribbon shape about 200Å thick and 4000Å wide. Critical currents based on the total area are greater than 106A/cm2in zero field and greater than 104A/cm2at 14 Tesla so the performance compares favorably with commercial tape or commercial multifilamentary wire. Special features of the material are the ease of fabrication, the low reaction temperatures (500°C), strain tolerance, and the strength of the material.
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Finnemore et al. (1979) studied this question.
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